I have a single custom list and two content type with some fields.Dynamically how can I add child node in a selected treeview parent node.

Update
Hi Manas,
I have a single ManageGroup list with two folder content type.I have added three site column in each folder content type.Suppose, i have selected parent folder content type or child folder content type, that value is going to add in ManageGroup list. I am able to populate list item in a treeview.

Could you please provide with some more details. If you want to fill in the nodes dynamically when user selects then you could create a mouse left click or mouse double click event for treeview and from these events you can get the selected nodes and dynamically add nodes to selected node.